/*-------------------------------------------------------------------------
 *
 * clogdesc.c
 *      rmgr descriptor routines for access/transam/clog.c
 *
 * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *      src/backend/access/rmgrdesc/clogdesc.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include "access/clog.h"


void
clog_desc(StringInfo buf, XLogReaderState *record)
{
    char       *rec = XLogRecGetData(record);
    uint8        info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;

    if (info == CLOG_ZEROPAGE)
    {
        int            pageno;

        memcpy(&pageno, rec, sizeof(int));
        appendStringInfo(buf, "page %d", pageno);
    }
    else if (info == CLOG_TRUNCATE)
    {
        xl_clog_truncate xlrec;

        memcpy(&xlrec, rec, sizeof(xl_clog_truncate));
        appendStringInfo(buf, "page %d; oldestXact %u",
                         xlrec.pageno, xlrec.oldestXact);
    }
}

const char *
clog_identify(uint8 info)
{
    const char *id = NULL;

    switch (info & ~XLR_INFO_MASK)
    {
        case CLOG_ZEROPAGE:
            id = "ZEROPAGE";
            break;
        case CLOG_TRUNCATE:
            id = "TRUNCATE";
            break;
    }

    return id;
}
